Writing this from Canada and am wondering if one needs a water filter that filters out viruses? Are there viruses located in Tassie's fresh water systems. We are planning on some multi-day hikes and currently have a filter that doesn't filter viruses. Please advise if possible.

I have walked a lot in Tasmania on many of the tracks - Overland, Walls of Jerusalem, South Coast etc. and never filtered water. Just be careful of where you collect the water i.e. upstream from camps etc. and you will be fine. Others may have a different view but I know many who don't filter and have never had any issues.